Fastening piece of sprinkler head



FIG. 1 is a perspective view of a fastening piece of sprinkler head showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof.

FIG. 8 is another perspective view showing the fastening piece of sprinkler head; and,

FIG. 9 shows a sprinkler head with the fastening piece.

The broken lines in the drawing depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a fastening piece of sprinkler head, as shown and described. 